The Time Machine was set up in the staircase of the Kronprinzenpalais next to the office of the Humboldt Forum and makes a direct reference to the Berlin City Palace, in which the future Humboldt Forum will be located. The time machine represents an alternative offer for the supporters of the reconstruction of the Berlin City Palace. It promises the return to the time of the Prussians to experience the real Berlin City Palace. The future city palace will always remain a reconstruction.